9. Sub-disciplines arise
While most of the social science disciplines deal with people, some have developed a specific interest in demographic analysis and demographic theories, and these have been formalized into sub-disciplines of demography. In many cases they represent a merging of an area within the main discipline of demography. ‘Sub-disciplines arise’ looks at several of these sub-disciplines in turn: anthropological demography, bio-demography, economic demography (or population economics), family demography, historical demography, mathematical demography, palaeodemography, population geography (or spatial demography), population studies, and social demography. These all now form part of a broad field of population studies that analyse the relationships between economic, social, cultural, and biological processes influencing a population.